Shinichi Izumi, a 17-year-old, finds himself infected by a parasyte, a vicious creature that preys on and feeds on humans. His survival hinges on his ability to navigate life as part monster, part person.
The whole world is about to change one quiet evening with the arrival of parasytes who devour human brains.
As Shinichi and his parasyte continue their unasked-for coexistence, the parasyte in his right (migi) arm decides to take on the name of "Migi."
As the number of mincemeat murder victims grows, Shinichi, alone in his knowledge of the truth, is in turmoil.
Shinichi's life returns to "normal" after A's killing spree, but Shinichi remains in low spirits.
Running late to school, Shinichi sees Nagai in trouble with some punks. When Shinichi steps in to help, he meets a high school student, Kimishima Kana.
Struck through the heart by his mother-turned-parasite, Shinichi survives only through Migi's efforts.
Thinking he'd found his mother's killer, Shinichi instead meets Uda Mamoru, a man in a similar situation as himself.
Shinichi has regained some semblance of a normal life. However, with Migi's cells dispersed throughout his body, his physical abilities have greatly increased to the point that not even Mitsuo poses a threat.
Yuko is drawn to Shimada Hideo, but gradually realizes that something is seriously amiss with Shimada's face itself.
Incapable of rationala thought, Shimada Hideo is a savage beast on a rampage, and Satomi's class has become his prey.
Kana's feelings for Shinichi grows day by day, and so does Shinichi's apprehension about Kana's ability.
Kana's special ability is gaining in strength. Believing that ignoring her will only endanger her life, Shinichi tells Kana everything about the parasites.
A few days after Kana's death, things seem to be back to normal for Shinichi.
Shinichi's secret becomes known to Kuramori, the private investigator hired by Tamura.
Though still full of doubt, Kuramori has, for the time being, accepted Shinichi.
The newest parasite to appear is different from the others. Chatty and expressive, the parasite identifies himself as Miki and immediately makes his move.
Having determined Tamura to be a threat, Kusano's group moves to eliminate her. Meanwhile, Kuramori moves to avenge his family's death by abducting Tamura's baby.
Shinichi and Migi arrive at the park, only to find Tamura holding her child.
Suspecting Shinichi's connection to the parasite cases, Hirama arranges to have Shinichi meet with Uragami, a convict with a peculiar ability.
The joint operation by the police and the strike force to eliminate the group of parasites led by Hirokawa has begun.
The assault squad succeeds in eliminating Hirokawa, the parasites' leader, but they find themselves in a bind when the ultimate parasite appears.
Motivated by Satomi to stay alive, Shinichi resolves to fight Gotou. With Migi's support, they press their attack in an isolated forest.
With no chance to survive, Shinichi pulls off a desperate move.
With Gotou's defeat, Shinichi's life is finally back to "normal." Though saddened by Migi's sudden departure, Shinichi moves forward with his life.
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